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8.015  Articles
1 of 803 pages  |  10  records  |  more records»
The objective of this paper is to identify some student’s conceptions of the straight line and two parallel lines. This will allow us to evaluate the distance that exists between their conceptions and the theory of these concepts. In doing so, we analyzed... see more

Background: Visualisation is a crucial skill for several everyday life activities and conceptual construction and development. Objectives: As it represents a substantial part of Euclidean geometry, this article addresses: the study and analysis of the rel... see more

Book review by Mark Seasons of No Straight Lines: Local Leadership and the Path from Government to Governance in Small Cities, Terry Kading editor.

The length of the gravitational field lines/of the orthogonal trajectories of a family of gravity equipotential surfaces/of the plumbline between a terrestrial topographic point and a point on a reference equipotential surface like the geoid í also known ... see more

Prospective mathematics teachers experience errors in solving straight-line equations, such as using unorthodox methods, answers that conflict with concepts and wrong calculations. This study aimed to analyze the difficulties of prospective mathematics te... see more

We show that 4-connected plane triangulations can be redrawn such that edges are represented by straight segments and the vertices are covered by a set of at most 2n lines each of them horizontal or vertical. The same holds for all subgraphs of such trian... see more

We investigate the problem of drawing graphs in 2D and 3D such that their edges (or only their vertices) can be covered by few lines or planes.  We insist on straight-line edges and crossing-free drawings.  This problem has many relations to oth... see more

An enhancer trap system is an insertional mutagenesis based upon gene expression, instead of gene knock-out, so its insertion in genome is  expected not linked to any dramatic changes in plant phenotypes. Gene  knock-out, leading to lossof- func... see more

Epistemological obstacle is one of the learning obstacles that need enough attention in overcoming it, Epistemological obstacle is the learning barrier that occurs because of the limitations of the context possessed by the students. This study aims to ana... see more

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